rust/compiler/rustc_parse/src
bors eac6c33bc6 Auto merge of #100869 - nnethercote:replace-ThinVec, r=spastorino
Replace `rustc_data_structures::thin_vec::ThinVec` with `thin_vec::ThinVec`

`rustc_data_structures::thin_vec::ThinVec` looks like this:
```
pub struct ThinVec<T>(Option<Box<Vec<T>>>);
```
It's just a zero word if the vector is empty, but requires two
allocations if it is non-empty. So it's only usable in cases where the
vector is empty most of the time.

This commit removes it in favour of `thin_vec::ThinVec`, which is also
word-sized, but stores the length and capacity in the same allocation as
the elements. It's good in a wider variety of situation, e.g. in enum
variants where the vector is usually/always non-empty.

The commit also:
- Sorts some `Cargo.toml` dependency lists, to make additions easier.
- Sorts some `use` item lists, to make additions easier.
- Changes `clean_trait_ref_with_bindings` to take a
  `ThinVec<TypeBinding>` rather than a `&[TypeBinding]`, because this
  avoid some unnecessary allocations.

r? `@spastorino`
2022-09-01 08:01:06 +00:00
..
lexer Shrink Token. 2022-08-01 08:53:04 +10:00
parser Auto merge of #100869 - nnethercote:replace-ThinVec, r=spastorino 2022-09-01 08:01:06 +00:00
lib.rs Revert let_chains stabilization 2022-08-29 19:34:11 +02:00
validate_attr.rs Overhaul MacArgs::Eq. 2022-05-05 07:06:12 +10:00